In case the USB backend device has not been initialized/probed, USB SND device connections can still occur. When the USB backend is eventually made available, previous USB SND device connections are not communicated to the USB backend. Call snd_usb_rediscover_devices() to generate the connect callbacks for all USB SND devices connected. This will allow for the USB backend to be updated with the current set of devices available.
Signed-off-by: Wesley Cheng quic_wcheng@quicinc.com --- sound/soc/soc-usb.c | 2 ++ sound/usb/card.h | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/sound/soc/soc-usb.c b/sound/soc/soc-usb.c index 84dc6d0b2eab..a9413e3d18df 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -111,6 +111,8 @@ struct snd_soc_usb *snd_soc_usb_add_port(struct device *dev, void *priv, list_add_tail(&usb->list, &usb_ctx_list); mutex_unlock(&ctx_mutex);
+ snd_usb_rediscover_devices(); + return usb; } EXPORT_SYMBOL_GPL(snd_soc_usb_add_port); diff --git a/sound/usb/card.h b/sound/usb/card.h index dfd241334e3d..6a14b74b47da 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -236,6 +236,7 @@ static struct snd_usb_stream *snd_usb_find_suppported_substream(int card_idx, { return NULL; } -void snd_usb_rediscover_devices(void) { } + +static void snd_usb_rediscover_devices(void) { } #endif /* IS_ENABLED(CONFIG_SND_USB_AUDIO) */ #endif /* __USBAUDIO_CARD_H */